import java.util.concurrent.Semaphore;
import java.util.concurrent.locks.ReentrantLock;

public class Demo3 {
    private static int count=0;
    public static void main(String[] args) throws InterruptedException {
        ReentrantLock locker=new ReentrantLock(true);
        Semaphore semaphore=new Semaphore(1);
        Thread t1=new Thread(()->{

            for (int i = 0; i < 50000; i++) {
           //     locker.lock();
                try {
                    semaphore.acquire();
                    count++;
                    semaphore.release();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

       //         locker.unlock();
            }
        });
        Thread t2=new Thread(()->{
            for (int i = 0; i < 50000; i++) {
               // locker.lock();
                try {
                    semaphore.acquire();
                    count++;
                    semaphore.release();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            //    locker.unlock();
            } 
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count=  "+count);
    }
}
